Envelop-opener and paper-knife.



J. W. l-VORY;

ENVELOP OPENER AND PAPER KNIFE.

armcmon man OCT. 11, 1916.

Patentefl Mar. 12, 1918.

INVENTOR A E ar, pa iament-ire, man uver-we,

nnvnnor-ornnnn AND PAPER-KNIFE.

Specification of Letters Patent.

Patented-Mar, 12; 1918;,

To all whom it may concern Be, it, knownthat 1 James Ivory, a bj ct r 1f the; Kin-g 0f Grea Britain,- r si ng in he y ndg un y f Phila elphi State o ennsylvania, Ira -invented nd sefu Envelep Owner nd Paper:- Km'fa-of whi hthe ell wings aspen-i cation.

My inyention consists of knife. for, V slite; pen h flep f re velepi eyer ng, the fold of a slip of a pieee of paper, or slitting the uncntileavesvof a book, pamphlet, magazine, etc, and for. other purposes, as will be hereinafter described;

The invention is satisfactorily. illustrated in the accompanying;drawing, butthe' important instrumentalities. thereofimay be varied, and so it-is to be understoodthat the invention is not limited to the specific details ow an rdescrib d gu e nd 41 r p esen ide; el atiens of different forms. of: knives embodyingmy invention.

gepr se s a an ve se ection 1 line 2-2 Fig, 1

Fig. 3 represents atransversesection on line 373mg. 1.

g a 6 a nd 7 represent sid lemtie s of other en bodiinentsofrthe invention. Fig. 8 represents an edge view of another embodiment thereof.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to: the drawingst? l designates the blade of the knife, 2 the cutting edge thereof, 3 the curved back thereof, 4; the handle thereof, and 5 designates a bill or segmental member on the point portion of the blade. The handle eX tends at an angle from the inner terminal of the blade, the upper margin of said bill being comparatively on a line drawn from the upper edge of said handle.

The blades in Figs. 1 and 4 are arcuatc downwardly from the bills 5 of the blades to the heels of the latter where they join the handles thereof, and they may be long and deep, or short and shallow.

The edges of the bill or front end of the blade especially in front and on top while being blunt or dull, are sufficiently pointed at the front, so as to readily enter the fold of an envelop, piece of paper, etc, Without cutting the same, after which the bill forms a guide for the bladein its motion during theg'cutting operation, as. will be, hereinafter more fully described,

Itwillbe noticedthat the cutting, edge curves downwardly and upwardly from the,

bill to; he. han le, n aryns r ml a stralght edge'from the front point at the, lower-edgeof the bill to ,said handle, so as to presentanangle to the fold to be, cut or,

severed, and, this angle may vary. from a stra ght edge shallow and short, or deep and long,'making a long on short blade while the handle. extends at an angle asrepresented 1n the drawmg, upwardly from. the inner terminal ofthe-blade l, so as to cause the shear ng action or-draw cut; of,v the cutting edgeon-the fold of an envelop,piece of pm per, etc, as, will be here nafter aga n, referred to,

r; depress on isformed in the blade .where the cutting edge of the latter joins, the hill 5 toiassist instarting-promptly the cutting of, the. foldof, the envelop, piece i Paper,

ete, after, the inner terminal ,of the bill passes such fold, piece, etc. Inlijig. 1, thequrve is about one-winch and ahalf, and the lengthiof and about the same distance of arcuate edge n h e t Jew he hand e The angle of the anterior curve of the lade isd-iffe ent tem the ordinary. blade, inasmuch as it curves upward forward from the line of the handle, while the ordinary blade is merely on a line with the handle and has no guide segment to follow in the fold of paper or envelop.

The depth of the actual cutting edge of the blade at its lowest point is less than a half inch from. the horizontal line between the point of the bill and the handle. The front angle of the blade runs downward from the point of the segment and has a similar thickness of blade throughout its entire cutting surface in the direction of the length of the same to the curved center and also on the upwardly extending angle terminating at a point near the horizontal handle line.

In operating the device, at an angle sa 35 or more intersecting the line of the fold of an envelep or jpiwe of the handle is held paper. The point of the bill is then inserted under the edge of the flap or piece of paper at the fold line thereof, and the knife is moved along, when the bill guides the blade on said fold line without cutting, tearing, penetrating or fracturing said line,

. made of light material is vastly strengthened by the crimp. In this case the blade and handle are integral, as in Fig. l.

The angle of the blade in comparison to an ordinary blade for opening an envelop, or cutting folds are on the sides like an equilateral triangle while the direction of the handle is the same. 7

The angle of outtin is forward and outward at an angle of a out the anterior curve of the blade following the guide segment at about this angle, but the blade being on a line with the handle, the point would be at a cross direction to the anterior angle shown in Figs. 1 and 2, and hence contrary to a correct angle for cutting or slitting open an envelop.

As shown in Fig. 8, the blade tapers in longitudinal direction from the guide bill or guide pilot 5 toward or to the handle, so as to gradually reduce in thickness in said direction, whereby it offers less resistance and friction to the fold of an envelop or. piece of paper, etc., and so it cuts clean and easier than heretofore, especially in a push stroke of the blade in the cutting or slitting opera- 7 tion.

In all cases, the guide bills or guide pilots Copies of this patent may be obtained for 5 are substantially the same in operation and result.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is

1. .A knife of the character stated composed of a blade having an arcuate cutting edge, and a handle, the latter extending inclined upwardly from the heel of said blade, the upper margin of the point of said blade being on a line drawn from the upper edge of said upwardly inclined handle. V

2. A knife of the character stated composed of a blade having an inturnedarcuate cutting edge, a bill on its front end, and a handle, the latter extending angularly rearward of said blade, the edges of the point and sides of the bill' being comparatively blunt and dull, the upper margin of said bill being comparatively on a line drawn from the upper edge of said angular extending or inclined handle.

3. In a knife of the character stated, a blade having an arcuate cutting edge, a handle which is inclined from the rear end of said blade, and a dulled bill on the forward end of said blade, said blade having therein a depression intermediate of the bill and the cutting edge of the blade 4. A lmife of the character stated composed of a blade having an inturned arcua-te cutting margin, and a bill on itsforward end, the edges of the point and sidesbeing blunt and dull, and a handle, which latter extends at an angle from the inner terminal of said blade in the longitudinal direction of the latter, the upper edge of said bill being comparatively on a line drawn from' the upper edge of said inclined handle.

' JAMES W. IVORY.

lVitnesses: Y

JOHN A. l VIEDERSHEIH, N. BUSSINGER.

five cents each, by addressing the Commissioner of Patents, Washington, D. U. 4 V 

